Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 27,566	$ 28,864
Accounts receivable, net	16,351	13,786
Inventories, net	3,221	2,651
Prepaid expenses and other current assets	446	391
Total current assets	47,584	45,692
Fixed assets, net	2,380	2,401
Lease right-of-use assets - operating	8,892	9,026
Lease right-of-use assets - finance	2,617	2,842
Other non-current assets	471	456
Total assets	61,944	60,417
Current liabilities:
Accounts payable	8,076	7,246
Accrued liabilities	4,550	3,018
Current portion of lease liabilities - operating	449	426
Current portion of lease liabilities - finance	1,021	1,083
Total current liabilities	14,096	11,773
Non-current portion of lease liabilities - operating	9,598	9,736
Non-current portion of lease liabilities - finance	1,221	1,428
Total liabilities	24,915	22,937
Commitments and contingencies (see Note 10)
Shareholders’ equity:
Preferred stock, $0.0001 par value, 5,000,000 shares authorized; 2,106 shares and 2,090 shares issued and outstanding at December 31, 2021 and March 31, 2022, respectively.
Common stock, $0.0001 par value, 150,000,000 shares authorized; 16,849,805 shares and 16,850,161 shares issued and outstanding at December 31, 2021 and March 31, 2022, respectively.	2	2
Additional paid-in capital	306,146	303,829
Accumulated deficit	(269,119)	(266,351)
Total shareholders’ equity	37,029	37,480
Total liabilities and shareholders’ equity	$ 61,944	$ 60,417